scripts: Hyphenate option arguments

Missed in commit 36a5005fcaa9b69efb2e9b08c0efe0f88042c5b3.

scripts/dpkg-scanpackages.pl

@@ -64,7 +64,7 @@ sub version {
 
 sub usage {
     printf _g(
-"Usage: %s [<option> ...] <binarypath> [<overridefile> [<pathprefix>]] > Packages
+"Usage: %s [<option> ...] <binary-path> [<override-file> [<path-prefix>]] > Packages
 
 Options:
   -t, --type <type>        scan for <type> packages (default is 'deb').

scripts/dpkg-scansources.pl

@@ -81,7 +81,7 @@ sub version {
 
 sub usage {
     printf _g(
-"Usage: %s [<option> ...] <binarypath> [<overridefile> [<pathprefix>]] > Sources
+"Usage: %s [<option> ...] <binary-path> [<override-file> [<path-prefix>]] > Sources
 
 Options:
   -n, --no-sort            don't sort by package before outputting.

scripts/dpkg-shlibdeps.pl

@@ -552,10 +552,10 @@ sub usage {
 Positional options (order is significant):
   <executable>             include dependencies for <executable>,
   -e<executable>           (use -e if <executable> starts with '-')
-  -d<dependency-field>     next executable(s) set shlibs:<dependencyfield>.
+  -d<dependency-field>     next executable(s) set shlibs:<dependency-field>.
 
 Options:
-  -p<varname-prefix>       set <varnameprefix>:* instead of shlibs:*.
+  -p<varname-prefix>       set <varname-prefix>:* instead of shlibs:*.
   -O                       print variable settings to stdout.
   -L<local-shlibs-file>    shlibs override file, not debian/shlibs.local.
   -T<substvars-file>       update variables here, not debian/substvars.